Water Condensation in Screen & need new back cover :(

Hey so here's my dilemma. Last night my Phone got lost/stolen in a club (The one time I go, right? Ugh.) Against all odds found it but it was missing the back cover and the screen has water condensation in it. Seems to be working fine though!

Anyway I can get rid of the moisture? Where can I buy a new back cover? Any help is greatly appreciated!